Spatial Expansion of Built-Up Areas in the Beijing–Tianjin–Hebei Urban Agglomeration Based on Nighttime Light Data: 1992–2020
Abstract
:1. Introduction
2. Data and Method
2.1. Study Area
2.2. Data Source
2.3. Built-Up Areas Extraction
2.4. Urban Expansion Indices
3. Built-Up Areas Extraction and Spatial Expansion Features
3.1. Results of Built-Up Areas Extraction
3.2. Rapid Expansion of Built-Up Areas in the Beijing–Tianjin–Hebei Urban Agglomeration
3.3. Great Disparities in the Spatial Expansion of Prefecture-Level Cities
3.3.1. Differences in the Spatial Scale of Cities
3.3.2. Great Disparities of Expansion Speed
3.3.3. Periodic Differences of Urban Expansion
4. Evolutionary Characteristics of the Spatial Structure of the Built-Up Areas
4.1. 1992–2000: Monocentric Expansion
4.2. 2000–2010: Polycentric Expansion in Core Cities and Monocentric Expansion in Node Cities
4.3. 2010–2020: Metropolitan Areas Emerging in Core Cities and Polycentric Expansion in Node Cities
5. Conclusions
- (1)
- The spatial expansion of the Beijing–Tianjin–Hebei urban agglomeration has strong momentum. Specifically, both expansion speed and expansion intensity first increased and then decreased over the study period. Beijing and Tianjin, the two core cities, occupy more than 50% of the built-up areas and the corresponding DN value of the whole region. The rapidly expanding cities in the Beijing–Tianjin–Hebei region are Tangshan, Baoding, and Shijiazhuang, while Hengshui and Zhangjiakou, located at the north and south ends, have failed to gain momentum. From the above analysis, we found that there is a profound relationship between urban spatial expansion and economic growth. From 1992 to 2000, China was against a background of slowing growth—moving away from a planned economy towards a market economy—and the driving force of urbanization had not been fully stimulated yet. However, the Beijing–Tianjin–Hebei area entered a new stage during the following decade that boosted economic growth and accelerated urbanization progress by developing its manufacturing industry. In 2014, the coordinated development of Beijing, Tianjin, and Hebei rose to the forefront of the national strategy. The three areas established multilevel cooperation since the implementation of the policy to remove Beijing’s noncapital functions through an industrial connection and the synchronous construction of educational and medical resources in the central cities of Beijing, Tianjin, Langfang, Baoding, and Tangshan.
- (2)
- The spatial expansion of built-up areas in the Beijing–Tianjin–Hebei urban agglomeration demonstrated an obvious periodic characteristic, which means that the expansion of core cities such as Beijing and Tianjin is performed with slower speed but better quality, while that of Cangzhou, Shijiazhuang, Baoding, Xingtai and other node cities are characterized by rapid expansion speed. The most rapidly expanding area was located in two megacities—Beijing and Tianjin—from 1992 to 2010, when the expansion speed reached 94.72 km2/a and 72.46 km2/a, respectively, and the expansion intensity reached 0.60, thus demonstrating a tendency of denotative expansion. After 2010, the expansion speed and intensity showed a downwards trend; however, the corresponding DN value increased steadily, so we found that the expansion mode of core cities followed connotative promotion during this period, while that of node cities was characterized by denotative expansion with high speed but inferior quality.
- (3)
- The spatial organization of the Beijing–Tianjin–Hebei region follows the evolution law of the monocentric model-polycentric model-metropolitan model. In the initial stages of urbanization, the expanding built-up areas were predominantly located in the municipal districts at the prefectural level or concentrated in the counties at the periphery of Beijing, Tianjin, Tangshan, and Shijiazhuang. In the 1990s, the strengthening of administrative barriers led to a free-for-all in urban governance, a lack of connection between regions, and insufficient vitality in economic development. The spatial organization structure, particularly in core cities, is presented as a single cluster with circling expansion. As cities adjust their spatial organization structure from a “monocentric model” to a “polycentric model”, the built-up areas in regional central cities such as Langfang, Baoding, Shijiazhuang, Qinhuangdao, Shijiazhuang, and Chengde are distributed discontinuously as spots or lines owing to the radiation effect of core cities. The urban expansion was in a disordered state from 2000 to 2010, with a single cluster expanding along the traffic artery. Infill growth always occurred in the core cities after 2010; however, the constantly emerging “new towns” and “satellite cities” around node cities ended up becoming the main carriers of urban spatial expansion in the region. The spatial organization of metropolitan areas appears gradually over time.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Period | Increment of Built-Up Areas (km2) | Increment of DN Value | Expansion Speed (km2/a) | Expansion Intensity |
---|---|---|---|---|
1992–2000 | 469.76 | 111,251 | 58.72 | 0.03 |
2000–2010 | 2334.10 | 193,764 | 233.41 | 0.11 |
2010–2020 | 1037.53 | 44,143 | 103.75 | 0.05 |
City | Expansion Speed km2/a | Expansion Intensity | Increment of DN Value /km2 | ||||||
---|---|---|---|---|---|---|---|---|---|
1992–2000 | 2000–2010 | 2010–2020 | 1992–2000 | 2000–2010 | 2010–2020 | 1992–2000 | 2000–2010 | 2010–2020 | |
Beijing | 23.10 | 94.72 | 1.19 | 0.14 | 0.58 | 0.01 | 51.01 | 81.67 | 1315.04 |
Tianjin | 8.93 | 72.46 | 1.75 | 0.08 | 0.62 | 0.01 | 114.29 | 81.86 | 394.92 |
Shijiazhuang | 2.89 | 10.71 | 13.86 | 0.02 | 0.07 | 0.09 | 62.86 | 12.89 | 2.41 |
Tangshan | 3.94 | 16.59 | 10.01 | 0.03 | 0.12 | 0.07 | 441.29 | 139.09 | 25.36 |
Qinhuangdao | 0.96 | 2.38 | 5.32 | 0.01 | 0.03 | 0.07 | 157.66 | 13.28 | 7.40 |
Handan | 4.11 | 6.09 | 6.51 | 0.03 | 0.05 | 0.05 | 821.06 | 199.97 | 53.90 |
Xingtai | 1.58 | 6.79 | 11.41 | 0.01 | 0.05 | 0.09 | 301.33 | 89.43 | 21.16 |
Baoding | 1.93 | 12.39 | 13.58 | 0.01 | 0.06 | 0.06 | 1020.74 | 146.64 | 14.27 |
Zhangjiakou | 0.96 | 1.61 | 2.10 | 0.00 | 0.00 | 0.01 | 148.29 | 13.66 | 9.28 |
Chengde | 2.80 | 2.52 | 11.06 | 0.01 | 0.01 | 0.03 | 1208.29 | 194.51 | 71.32 |
Cangzhou | 1.23 | 1.96 | 18.55 | 0.01 | 0.01 | 0.13 | 733.30 | 66.74 | 11.92 |
Langfang | 4.99 | 4.55 | 3.50 | 0.08 | 0.07 | 0.05 | 391.07 | 198.04 | 20.92 |
Hengshui | 1.31 | 0.63 | 4.90 | 0.01 | 0.01 | 0.06 | 103.42 | 19.80 | 30.25 |
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Zhang, H.; Liang, C.; Pan, Y. Spatial Expansion of Built-Up Areas in the Beijing–Tianjin–Hebei Urban Agglomeration Based on Nighttime Light Data: 1992–2020. Int. J. Environ. Res. Public Health 2022, 19, 3760. https://doi.org/10.3390/ijerph19073760
Zhang H, Liang C, Pan Y. Spatial Expansion of Built-Up Areas in the Beijing–Tianjin–Hebei Urban Agglomeration Based on Nighttime Light Data: 1992–2020. International Journal of Environmental Research and Public Health. 2022; 19(7):3760. https://doi.org/10.3390/ijerph19073760
Chicago/Turabian StyleZhang, Hua, Chen Liang, and Yuxuan Pan. 2022. "Spatial Expansion of Built-Up Areas in the Beijing–Tianjin–Hebei Urban Agglomeration Based on Nighttime Light Data: 1992–2020" International Journal of Environmental Research and Public Health 19, no. 7: 3760. https://doi.org/10.3390/ijerph19073760